uri分析三要素中不包括()。
A.路由选择子
B.SIP方法
C.uri统一标识
D.SIP路由集
参考答案:D
He is only too ready to help others, seldom, _____, refusing them when they turn to him.
A.if not
B. if ever
C.if any
D.if so
The whole team were wild with joy when their captain___________top in the race.
A.came up
B.came out
C.turned up
D.went out